X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fidx.h;h=0b31696c772840c347aa0fad1aa9e71099de93c7;hp=02caba5a93c058a308588c6e53c68b6635c25538;hb=c4c5bcaff965970d7632eeea9bb9cb31b99a9251;hpb=b9cd4b49ffbfbf3e1c36a2b594ec3148a5baca64

diff --git a/ginac/idx.h b/ginac/idx.h
index 02caba5a..0b31696c 100644
--- a/ginac/idx.h
+++ b/ginac/idx.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's indices. */
 
 /*
- *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2002 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -24,6 +24,7 @@
 #define __GINAC_IDX_H__
 
 #include "ex.h"
+#include "numeric.h"
 
 namespace GiNaC {
 
@@ -45,15 +46,19 @@ public:
 	 *  @return newly constructed index */
 	explicit idx(const ex & v, const ex & dim);
 
-	// functions overriding virtual functions from bases classes
+	// functions overriding virtual functions from base classes
 public:
 	void print(const print_context & c, unsigned level = 0) const;
 	bool info(unsigned inf) const;
 	unsigned nops() const;
 	ex & let_op(int i);
-protected:
+	ex evalf(int level = 0) const;
 	ex subs(const lst & ls, const lst & lr, bool no_pattern = false) const;
 
+protected:
+	ex derivative(const symbol & s) const;
+	bool match_same_type(const basic & other) const;
+
 	// new virtual functions in this class
 public:
 	/** Check whether the index forms a dummy index pair with another index
@@ -66,19 +71,26 @@ public:
 	ex get_value(void) const {return value;}
 
 	/** Check whether the index is numeric. */
-	bool is_numeric(void) const {return is_ex_exactly_of_type(value, numeric);}
+	bool is_numeric(void) const {return is_exactly_a<numeric>(value);}
 
 	/** Check whether the index is symbolic. */
-	bool is_symbolic(void) const {return !is_ex_exactly_of_type(value, numeric);}
+	bool is_symbolic(void) const {return !is_exactly_a<numeric>(value);}
 
 	/** Get dimension of index space. */
 	ex get_dim(void) const {return dim;}
 
 	/** Check whether the dimension is numeric. */
-	bool is_dim_numeric(void) const {return is_ex_exactly_of_type(dim, numeric);}
+	bool is_dim_numeric(void) const {return is_exactly_a<numeric>(dim);}
 
 	/** Check whether the dimension is symbolic. */
-	bool is_dim_symbolic(void) const {return !is_ex_exactly_of_type(dim, numeric);}
+	bool is_dim_symbolic(void) const {return !is_exactly_a<numeric>(dim);}
+
+	/** Make a new index with the same value but a different dimension. */
+	ex replace_dim(const ex & new_dim) const;
+
+	/** Return the minimum of the dimensions of this and another index.
+	 *  If this is undecidable, throw an exception. */
+	ex minimal_dim(const idx & other) const;
 
 protected:
 	ex value; /**< Expression that constitutes the index (numeric or symbolic name) */
@@ -102,11 +114,14 @@ public:
 	 *  @return newly constructed index */
 	varidx(const ex & v, const ex & dim, bool covariant = false);
 
-	// functions overriding virtual functions from bases classes
+	// functions overriding virtual functions from base classes
 public:
 	void print(const print_context & c, unsigned level = 0) const;
 	bool is_dummy_pair_same_type(const basic & other) const;
 
+protected:
+	bool match_same_type(const basic & other) const;
+
 	// non-virtual functions in this class
 public:
 	/** Check whether the index is covariant. */
@@ -144,11 +159,14 @@ public:
 	 *  @return newly constructed index */
 	spinidx(const ex & v, const ex & dim = 2, bool covariant = false, bool dotted = false);
 
-	// functions overriding virtual functions from bases classes
+	// functions overriding virtual functions from base classes
 public:
 	void print(const print_context & c, unsigned level = 0) const;
 	bool is_dummy_pair_same_type(const basic & other) const;
 
+protected:
+	bool match_same_type(const basic & other) const;
+
 	// non-virtual functions in this class
 public:
 	/** Check whether the index is dotted. */
@@ -172,19 +190,23 @@ protected:
 
 
 // utility functions
-inline const idx &ex_to_idx(const ex & e)
+
+/** Specialization of is_exactly_a<idx>(obj) for idx objects. */
+template<> inline bool is_exactly_a<idx>(const basic & obj)
 {
-	return static_cast<const idx &>(*e.bp);
+        return obj.tinfo()==TINFO_idx;
 }
 
-inline const varidx &ex_to_varidx(const ex & e)
+/** Specialization of is_exactly_a<varidx>(obj) for varidx objects. */
+template<> inline bool is_exactly_a<varidx>(const basic & obj)
 {
-	return static_cast<const varidx &>(*e.bp);
+        return obj.tinfo()==TINFO_varidx;
 }
 
-inline const spinidx &ex_to_spinidx(const ex & e)
+/** Specialization of is_exactly_a<spinidx>(obj) for spinidx objects. */
+template<> inline bool is_exactly_a<spinidx>(const basic & obj)
 {
-	return static_cast<const spinidx &>(*e.bp);
+        return obj.tinfo()==TINFO_spinidx;
 }
 
 /** Check whether two indices form a dummy pair. */